EP 1000509 A1 20000517 - ENCRYPTION DEVICES FOR USE IN A CONDITIONAL ACCESS SYSTEM
Title (en)
ENCRYPTION DEVICES FOR USE IN A CONDITIONAL ACCESS SYSTEM
Title (de)
DATENVERSCHLÜSSELUNGSVERFAHREN FÜR SYSTEME MIT BEDINGTEM ZUGRIFF
Title (fr)
DISPOSITIFS DE CRYPTAGE POUR SYSTEME A ACCES CONDITIONNEL
Publication
Application
Priority
- US 9816145 W 19980731
- US 5457597 P 19970801
Abstract (en)
[origin: WO9907150A1] A cable television system provides conditional access to services. The cable television system includes a headend from which service "instances", or programs, are broadcast and a plurality of set top units for receiving the instances and selectively decrypting the instances for display to system subscribers. The service instances are encrypted using public and/or private keys provided by service providers or central authorization agents. Keys used by the set tops for selective decryption may also be public or private in nature, and such keys may be reassigned at different times to provide a cable television system in which piracy concerns are minimized.
IPC 1-7
IPC 8 full level
G09C 1/00 (2006.01); H04L 9/08 (2006.01); H04L 9/10 (2006.01); H04L 29/06 (2006.01); H04N 7/10 (2006.01); H04N 7/16 (2006.01); H04N 7/167 (2006.01)
CPC (source: EP)
H04L 63/0442 (2013.01); H04L 63/045 (2013.01); H04L 63/062 (2013.01); H04N 7/163 (2013.01); H04N 7/1675 (2013.01); H04N 21/2265 (2013.01); H04N 21/26606 (2013.01); H04N 21/4405 (2013.01); H04N 21/4524 (2013.01); H04N 21/63345 (2013.01)
Citation (search report)
See references of WO 9907150A1
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
WO 9907150 A1 19990211; AU 8670598 A 19990222; AU 8823698 A 19990222; DE 69809757 D1 20030109; DE 69809757 T2 20030710; EP 1000509 A1 20000517; EP 1000509 B1 20021127; JP 2001512842 A 20010828; JP 2005218143 A 20050811; JP 2009089430 A 20090423; JP 2009124736 A 20090604
DOCDB simple family (application)
US 9816145 W 19980731; AU 8670598 A 19980731; AU 8823698 A 19980731; DE 69809757 T 19980731; EP 98939873 A 19980731; JP 2000505744 A 19980731; JP 2005120426 A 20050418; JP 2008321531 A 20081217; JP 2009008204 A 20090116